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Questions tagged [motor]

An electrical actuator that converts electrical energy into rotational motion or sustained linear motion (linear motor). There are many types of electric motors. If the specific type of motor is known, it is helpful to use or add a more specific tag, such as dc-motor, brushless-dc motor or induction-motor.

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SVPWM: Does setting modulation index to 0 still consumes power?

I've implemeneted a 3rd harmonic injection SVPWM (Space Vector PWM) scheme and it performs quite well. One peculiarity i have noticed was, when i set the modulation index to 0, the motor stops as ...
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FG servo motor speed issues

I have been trying to get a 40-year-old turntable back to life, with relative success until now. Everything works fine but for an intermittent issue with the motor. The motor has two modes (for 33 1/...
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65 views

Why does a motor not work after the power supply?

I have a fairly cheap breadboard power supply and a motor. Now if I touch the wires from the adaptor (the thing that plugs into the power supply to provide it with electricity) the motor works fine ...
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59 views

Where does the term 'plugging' (reversing current on dc motor for braking) come from? [on hold]

The title says it all... I understand what the term means - but am curious as to how the terminology came about?
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2answers
42 views

do the voltage and amperage applied to a motor matter as long as the wattage stays at what its rated for?

I have an electric 180w motor from an electric go cart which currently runs on lead acid batteries but I want to convert it to have a 18650 battery pack for a power supply but I cant find the rated ...
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1answer
62 views

Drill motor triggers battery protection. Why? [closed]

I modified an old 7.2V-NiCd-powered drill driver to use (16850) LiIon batteries. I made sure to use a cell combination that can output 8A as well as a BMS that is specified for this output, adding a ...
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1answer
47 views

Converting a 9.6V NiCad Drill to Li-on

I am trying to convert my 9.6V NiCad drill to run off a 12V Li-on battery. When I connect the Li-On directly, the motor only just slightly spins and stops. The only way I can get it to work is using a ...
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0answers
35 views

What kind of monophasic induction motor is this?

About 15 Years ago I bought an induction motor from a junk yard. It have 6 leads being that 2 are the same lead, so 5. The guy who sold me had no idea from what machine it came. And I don't quite ...
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3answers
3k views

Why is it harder to turn a motor/generator with shorted terminals?

The shaft of an unconnected motor is easy to rotate relative to a motor with shorted terminals. If a resistive load is connected to the terminals, the turning difficulty is somewhere in between. Why ...
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0answers
21 views

BEMF and zero crossing point detection

I am trying to control a BLDC motor without sensors using BEMF method and zero crossing detection. I managed to detect the zero crossing point but I am not sure if it is correct. I read that the hall ...
2
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2answers
67 views

Help Identifying what this component is

A friend of mine asked me if I could identify a component that keeps causing the flow of current to stop in a 12 V 1 motor system he has increased to 2 motors (perhaps due to overload or heat). He ...
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1answer
96 views

Is insulated copper wire required?

I am making a motor and was wondering if it is necessary to use insulated copper wire instead of any regular copper wire.
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1answer
31 views

Shunt DC motor controller improvement

A 1.4 A shunt DC motor, with brushes, in a home made pottery wheel from 1970s runs slightly erratically. In general I am well impressed with it as the motor choice is appropriate for the ...
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2answers
53 views

Powering 5 fans with a LTC 3780 : should I protect it against induction effect?

I want to power 5 fans in parallel (12V 0.80A, each) using a adjustable power supply (DIY, made with an LTC 3780 connected to a 24V 15A PSU and mini Voltmetre). I read that a fan could destroy the ...
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0answers
69 views

Will this H bridge work?

I designed this H bridge circuit. Will send the PCB for manufacturing soon, but just wanted to make sure I'm not doing a silly mistake. I want to drive the FETs at 15 kHz frequency. Given the current ...
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1answer
72 views

Will 126v damage a small motor rated for 120v?

I have 252v coming into my building (126 per leg) and a piece of equipment which uses a percentage timer that has a small motor on it which is rated for 120v. Will 126v fry the motor?
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0answers
25 views

BLDC bemf shape

I am trying to detect the zero crossing point of the BEMF voltage in order to control the motor sensorless. The following picture shows the ideal shape of BEMF and in many application notes or ...
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2answers
52 views

My hybrid motor starter keeps tripping

I have this exact motor starter on my AC braking motor (FLA 3.5A). The starting current is 12.1 A however and keeps tripping the relay after approximately ten minutes of use. The motor operates by ...
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2answers
86 views

Making a motor turn a certain amount by a button [closed]

I'm new here, so sorry for any inconvenience/misunderstanding. I want to have 4 motors that will all turn 90 degrees forward then stop on a button. Then when the same or different button is pressed, ...
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2answers
57 views

How can I get this 12v motor to run smoothly, and is it set up safely?

This is my first attempt at electrical engineering, so I'm sorry if this question seems basic, I couldn't seem to find answers anywhere. I want to wire a 12v motor to an on/off switch and power with ...
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1answer
64 views

will a 48V DC motor work with a 36V Battery and controller

I have 1000W / 48V ebike motor. I have a 36V battery and 1000 W controller from another ebike. Could I use the 36V battery and controller with the 48V motor?
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3answers
96 views

How to make a motor capable of resisting physical movement?

Is it possible to make a motor capable of resisting physical movement? For example, at the gym you control the resistance to movement by putting more load, more weight. Is there a way to control that ...
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1answer
33 views

Using arduino and transistor for motor control

I am currently a computer engineering student trying to build a simple circuit to vary voltage by using a transistor and a arudino uno. The motor draws between 12v and 28v with a current of about ...
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2answers
51 views

Stepper motor controlled by turning only in one direction and stalling in opposite direction

I am controlling a high-torque stepper motor (23Y204S from Anaheim Automation with 8 lead-wire) using a microstepping driver (MBC15081) and Arduino. The winding wiring is connected as bipolar series ...
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3answers
75 views

How “safe” is it to put a higher voltage into a small DC motor?

The main board in my old rechargeable philoshave failed. Not wanting to give up easily, I soldered direct onto the DC motor (as pictured). The motor is rated for 3.6V (pictured), but I get a much ...
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0answers
42 views

DC permanent magnetic motor control issues

We have a 180 V dc permanent magnet motor. When engaging the control board while the motor is hooked up. The output to motor drops out and reads no voltage. If I take the motor leads off the ...
3
votes
1answer
81 views

Is it necessary to provide surge suppressor to every control relay?

We have a motor control centre installed in garage for a commercial outlet. The MCC has a SMC-Flex ( Low voltage soft starter). The control relays (700 HA33) are connected to the SMC control ...
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1answer
29 views

Asynchronous single phase Motor do not start

I have got from my company scrap an old Alcatel Vacuum Pump. After taking apart the pump and cleaning everything, I tried to make the motor run. Unfortunately apart a noisy 50 Hz the motor don't turn....
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0answers
22 views

Flux and inductance in simple motor

This is the front view of a cylindrical motor of depth (or height) \$D\$. There are three windings: \$\alpha\$ (stator), \$\beta\$ (stator) and \$\gamma\$ (rotor): Considering the core to be of ...
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1answer
39 views

what would happen if I used a rheostat in series with a motor to drop my 230v ac supply to 110v ac?

I realize that I would be running higher (a little more than double) current through the motor I'm just curious if it would damage my motor? The motor is a 1 hp, 110V/60Hz driving a meat grinder.
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0answers
37 views

BLDC startup algorithm

How do real world algorithms for sensorless BLDC motors handle startup under load? Right now I run phase 1 for a few milliseconds to get the rotor in a known position, the I run open loop for a ...
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3answers
45 views

bldc regenerative braking, braking torque

I'm trying to figure out the braking torque calculation for a BLDC simulation. Now if I'm looking at a datasheet I know the torque at a given rpm at acceleration. If I brake with regenerative breaking ...
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2answers
77 views

Is there a motor design where a rotor gradually moves into a stater? [closed]

I was wondering if there is a motor/generator design where the rotor moves gradually in and out of the stator along the axis of rotation, or the stator over the rotor, but the primary motion is rotary,...
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1answer
29 views

what is field exitation type of 775 DC motor?

There are different types of field exitation modes. Some of them are Shunt wound series wound and permanent type So, what type of motor is 775 DC motor? i have tried to search the type from ...
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3answers
85 views

Speed limiter - 24v Motors

I'm looking for a way to limit the speed of some wheelchair motors in order to gain better control when using them in my RC device. Currently the motors are very sharp and don't ramp up to speed, ...
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1answer
26 views

calculation of torque constant based on bldc datasheet, getting different torque constants

I'm trying to get the torque constant of a bldc. Based on this: how to read datasheet I just divide the torque at any given point with the current. I tried out that method with different values and ...
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1answer
48 views

Pre charge resistor switch

I have a 12V 40A motor. I have a switch between the motor controller and the battery. I want to put a pre charge resistor in the path. Like in the figure. My questions are: 1) The pre charge ...
2
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1answer
46 views

Motor / VFD / Protective Earth

I have little experience with AC motors since I'm majoring in Mech.E. My team is setting up an AC motor with a VFD to control the movement of an airfoil inside a metal cage we built. I understand the ...
2
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1answer
43 views

Design of a motor SPDT switch that can be triggered by 5 V or 3.3 V digital output

Problem: I am designing the electrical system for a vehicle that has 12 brushed dc motors / linear actuators, they are driven by 6 identical dual-channel motor driver boards, that provide a maximum ...
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2answers
41 views

BLDC Motor max load

Hi i have a BLDC moter https://www.banggood.com/350W-48V-DC-Brushless-Motor-Geared-Ebike-Tricycle-Kit-Engine-Electric-Scooter-p-1419702.html?akmClientCountry=NL&rmmds=cart_middle_products&...
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1answer
46 views

VHS(C) tape speed issues - how does the speed change for different modes?

I have a VHS-C camcorder that has a lot of trouble keeping constant speed for the main tape motor (even with the battery fully charged). Most of the time it's way too fast (similar to fast forwarding),...
4
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1answer
585 views

Would the motor reverse if phases swapped for this case?

A servomotor power connection pins are given as follows: U V W are the three phase terminals. Would the motor reverse if I mistakenly swap phases U and V namely if I connect pin 1 to W and pin 3 to U?...
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1answer
33 views

motor or actuator which fits these specifications [duplicate]

This is a repeat question with more details; As a hobbyist and blissfully ignorant of electrical engineering, I wonder if someone out there is willing to give me some feedback? Is there a battery ...
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1answer
70 views

Don't know which transistor I should use

I am new to transistors. I want to know which transistor I should use which will suffice for my H bridge. My motor draws 1.2A at 6V when stalled.
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4answers
43 views

How do you drive a variable reluctance stepper/SRM as a generator?

I think I understand the principles, even if not the details, of operating a VR/SRM as a motor. But I don't understand, and can't find any good explanation online of, the principles for how to use one ...
0
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1answer
69 views

Attiny85 crashes when I run a motor through an L293D

I'm trying to run a motor through an L293D turned on and off by an Attiny85. The Attiny85 has the micronucleus bootloader on it, which is why pin 3 is connected to a pull up resistor. On the Attiny ...
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3answers
79 views

Motor Voltage and Current Limit of Brushed DC Motor

What fundamentally limits the applicable voltage in a motor? From what I understand, the input to the motor is a relatively constant impedance (since speed is on the order of 100 Hz) and it is ...
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1answer
34 views

Proper Way to Drive this H bridge

MIC4605-2YM Datasheet Given the circuit above what is the proper way to drive this H bridge in a manner where I can change the motor direction. the datasheet shows a sample circuit of a full H bridge ...
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1answer
41 views

Can you power ac motor in ev with ac generator? [closed]

Can a smaller ev with ac motor be powered by an ac gen instead of using a battery pack and everything that would go along with it? If so, what would the arrangement be going from gen to motor?
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3answers
166 views

How to control BTS7960 43A motor driver directions?

The board has two PWM inputs, see: Do I have to use four pins to control two motors? Thanks